Drill sharpening and swaging machines



June 13, 1933. J. RULE DRILL SHARPENING AND SWAGING MACHINES Filed March 3, 1932 4 Sheets-Sheet l June 13, 1933. RULE 1,914,170

DRILL SHARPENING AND SWAGING MACHINES Filed March 5, 1932 4 Sheets-Sheet 2 June 13,1933. J. RULE DRILL SHARPENING AND SWAGING MACHINES Filed March 5, 1932 4 Sheets-Sheet 3.

a0 %5 w F a June 13, 1933.

J. RULE 1,914,170.

DRILL SHARPENING AND SWAGING MACHINES Filed March 5, 1932 4 Sheets-Sheet" 4 WK? ///7////l/i Patented June 13, 1933 rlrrs TATES PATENT oFFIcE JAMEs RULE, or CORNWALL, "ENGLAND, ASSIGNOB. 'ro HOLMAN nnornnns LIMITED,

or CORNWALL, ENGLAND, A BRITISH COMPANY DRILL SHARPEhTINGr AND SWAGING MACHINES Application filed March 3, 1932, Serial No. 596,513, and in Great Britain J'uly lO, 1931.

The present invention consists in improvements in or relating to swaging machines such, for example, as drill-sharpening machines for sharpening rock-drills,and its object is to provide a convenient and economical apparatus of this type. The chief function of the machine according to the invention is for sharpening rock-drills but it is not limited to this use as it may be employed for any purposes of swaging, particularly where swaging of the workpieceis required in two directions inclined to one another.

For the purpose of convenience the two operations will be referred to hereinafter as forming and upsetting operations respectively because theseterms are particularly applicable to the formation and sharpening of the cutting extremities and faces of the drill-steels for rock-drills. Furthermore, for the sake of brevity, all such machines will be referred to hereinafter as drill;

" an inclined position (e. g.

sharpening machines.

' According to the present invention, a drill-sharpening machine includes a single hammer that is employed both-for upsetting and forming operations. Conveniently, a machine comprises the comblnation of clamping means for the drill-steel or the like, a dolly for the upsetting operation (e. g. for upsetting the end of the drill-steel), a forming tool for the forming operation (e. g. for operating on the lateral surfaces of the drill-steel), and a single fluid-operated hammer movable into operative relationship with either the dolly or the forming tool to operate either one of them at w1ll.

Thus, in such a'machine the hammer may be mounted so that it can be brought from one position for the upsetting operation to substantially at right angles thereto) for the forming operation. v

In a modification of the invention a drillsharpening machine comprises clamping means having two jaws whereofone is movable towards and away from the other by mechanical means and the other is movable at least in a direction towards the firstnamed jaw by fluid ressure.

Further features the inventionare embodied in a specific example which will now i v be described with reference to the accompanying drawings in which- Figure 1 is a side elevation of the drillsharpening machine according to the present invention showing the fluid-operated hams mer in theinclined position (e. g. for theupsetting operation) Figure 2 is also a side elevation thereof showing the fluid-operated hammer in the vertical position (e. g. for the forming operation); v

Figure 3 is a section through the clamping mechanism showing a drill-steel clamped'in position and is taken along the line33 of Figure 1; i Figure 4 is a section through the clamping mechanism showing the jaws open and is taken along the line 4-4 of Figure 2;

Figure 5 is a side elevation of the clamping control valve chest;

Figures 6, 7 and 8 are sections through the control valve chest showing the valve in different positions.

Like reference numerals refer to like parts throughout the several figures.

In the example of drill-sharpening machine shown in the accompanying drawings, the machine comprises a pneumatic hammer 10 of a known type, slidably mounted in two parallel guide-rods 11 with the aid of cross heads 12 secured to the hammer cylinder. The guide-rods are mounted in the frame of the machine so as to swing through a right angle to bring the axis of the hammer 10 either to a horizontal or a vertical position as shown in Figures 1 and 2 respectively. Thus when in the horizontal position, the hammer is movable towards and away from the dolly 13 slidably mounted in the dolly holder 14, and when inthe vertical position as shown in Figure 2, it is movable towards and awayfrom the forming or swaging die 15 slidably mounted in a bracket 160. I

The clamping mechanism for the drill comprises a clamping piston 16 slidable within a clamping cylinder 17 and two swing clamps 18 secured to opposite ends of a pivot pin 19 which is mounted in an upward extension 20 of the clamping cylinder 17, and

passes through an enlarged or elongated bore 21, in an upward extension 22 of the clamping piston 16. The guide-rods 11 on which the hammer 10 is carried are securely attached to the swing clamps 18, and there fore the hammer 10 also swings about the pivot pin 19 simultaneously with the swing clamps 18.

The lower gripping die or jaw 23 of the clamping means is mounted on the top of the extension 22 of the clamping piston. The upper die or jaw 24 is held in a saddle 25 slidable up and down on a pair of pins 26 extending upwardly from the top of the clamping cylinder extension. The saddle has two outward extensions 27 with the top of which hook-shaped surfaces 28 on the swinging clamps 18 engage when the hammer 10 is moved into the horizonal position. The swinging clamps 18 are also provided with cam surfaces 29 which engage underneath the outward extensions 27 of the saddl 25 and raise the latter when the hammer 10 is brought to a vertical position (see Figures 2 and 4). It will be appreciated that in order to clamp the heated drill, the drill 36 is placed on the lower jaw 23, the upper jaw 24 is brought down close to it by swinging the hammer 10 into a horizontal position and fluid pressure is then admitted to the underside of the clamping piston 16. A very slight movement of the clamping piston 16 is suflicient and the volume of the cylinder 17 can, therefore, be very small,

requiring only a small quantity of air for its operation. To remove the drill steel 30 the air is allowed to escape from under the piston 16 and the hammer 10 is then swung to a vertical position raising the saddle 27 and upper clamp 24 and releasing the drill.

Swinging movement of the hammer 10 from a vertical to a horizontal position, advancing and retracting movement of the hammer 10 along its guide-rods 11 and control of compressed air to the hammer 10 are all effected by a single hand lever 31 which is pivotally mounted on one of the swing clamps 18.

The hand lever is in the form of a bellcrank of which one long arm 31 serves as the handle and a short arm 32 inclined at an angle of some 30 to the long arm serves for advancing the hammer and for controlling admission of the air thereto. For this purpose the short arm 32 of the bell-crank is pivoted to a link 33 which extends through an eye 34 in the front cross-head 12 of the hammer and is surrounded on the further side by a compression spring 35 between the mer. room valve the stem 39 of which extends eye and a nut 36 at the end of the link. Theshort arm 32 of the bell-crank is also pivotally connected to an arm 37 serving to operate the fluid control valve 38 of the ham.- The valve is in the form of a mushinto a slot in the side of the valve casing 40 through which slot the operating arm 37 slides. The operating arm 37 is provided with a cut-away portion 41 which enables the valve to close on to its seating, but on withdrawing the arm 37 from athe slot 40 the inclined end 42 of the cut-away portion moves the valve from its seating and admits air to the hammer. Throughout the ma jority of the advancing movement of the hammer, the operating arm 37 and the valve 38 both move together and no fluid is admitted to the hammer. When, however, the front of the hammer engages the dolly or forming tool 13, further advance of the hammer is arrested; but the valve operating arm 37 and link 33 continue to be moved, at the same time compressing spring 35. The operating arm 37 is moved until the valve 38 is opened thus admitting compressed air to the hammer. The latter is held up to the dolly by a continued pull. on the handle 31 which also keeps valve 38 open until the up setting operation is complete.

The boss of the hand lever 31 is provided with an elongated hole 43 to permit of movement of the bell crank on its pivot in a direction normal to the pivotal axis. A lug 44 projecting from the boss has a substantially circumferential portion 46 which engages a stud 45 secured to the swing clamp 18 while the hammer is being advanced and prevents movement of the hand lever 31 at right angles to its pivotal axis. lVhen the hammer is fully retracted (Figure 2) the end of the circumferential portion 46 of the lug passes the stud 45 and the hand lever 31 can then slide on its pivot so that the lug 44 engages and locks against the stud 45 as shown in Figure 2. This enables the whole hammer and its swing clamp to be swung to a vertical position by means of the hand lever as indicated in the drawings. The hand lever 31 .is then pulled to disengage the lug 44 from the stud 45 and to enable the hammer to be advanced towards the forming tool in the same manner that it was previously advanced to the dolly.

For convenience, the apparatus described may be mounted on a bench or any other means of suitable height, While the clamping control valve mechanism may stand on the floor and be operated by a pedal 49. Pressure fluid from its main source is conveyed to the chamber 148 of the clamping control valve chest 48 through inlet T connection 150. A suitable length of flexible hose 50 may extend from the inlet T connection 150 to the control valve inlet of the hammer 10. A further length of flexible hose 47 con veys the pressure fluid from the clamping control valve to the clamping cylinder 17.

The clamping control valve chest 48 is provided with a cylindrical bushing 51 having three ports 52, 53, 54 axially spaced along it communicating respectively with the atmosphere, the clamping cylinderand the pressure fluid supply. The cylindrical valve member which fits within the bushing 51 is formed with a portion reduced diameter 56 to connect the centre port 53 with either of the end ports 52 or 54. The end ports are in fact afforded by the ends of the bushing and the end 57 of the valve member towards the fluid supply is provided with a mushroom head as an additional security against leakage when the valve is in its uppermost position as shown in Figure 8. A pedal lever 49 is pivoted at one end in a: fixed bracket 58' and bears on the top of the valve member 55. Thus, 7l1Il the pedal is fully depressed as shown in Figure 7, air flows from the supply to the clamping cylinder Via the port 53 and the flexible hose 47. On raising the pedal 49 slightly as shown in Figure 6, the clamping cylinder 17 "is cut off from the supply and from the atmosphere, and on releasing the pedal as shown in Figure 8, communication is established between the clamping cylinder and the atmosphere.

The clamping piston 16 is normally urged downwardly by means of a spring or springs such as. 59 so that when the pedal is released and the control valve takes up the position shown in Figure 8, air will be expelled from the clamping cylinder 17 to atmospherevia the ports 53 and 52.

Where reference is made herein and in the appended claims to a drill steel as the workpiece to be operated on it is to be. understood to refer to any workpiece that may require to be subjected to the operations that the machine is capable of providing.

I claim:

1. A drill sharpening machine comprising in combination a swinging frame, a hammer slidably mounted thereon and movable with the frame into positions respectively for upsetting and forming operations, and a single actuating handle operatively connected with the hammer to move it on the frame and also with a control valve by whichsupply of pressure-fluid to the hammer is controlled.

2. A drill sharpening machine comprising in combination a swinging frame, a hammer slidably mounted thereon and movable with the frame into positions respectively for upsetting and forming operations, a single actuating handle operatively connected with the hammer to move it on the frame and also with a valve-operating memher, a Valve to control supply of pressurefiuid to the hammer and a Valve-operating member slidable endwise in the general direction of the sliding movement of the hammer with a lost motion operative connection between it and the valve.

3. A drill sharpening machine comprising i in combination a swinging frame, a hammer slidably mounted thereon and movable with the frame into positions respectively for upsetting and forming operations, a valve to control supplyof pressure-fluid to the hammer, a valve-operating member and a single actuating handle comprising abellcrank lever one arm of which is operatively connected with the hammer and with the valve-operating member.

, 4:. A drill sharpening machine comprising in combination a swinglng frame, a haming frame and to be engaged therewith when the handle is at one extreme position in its movement at right angles to its pivotal axis.

5. A drill sharpening machine comprising in combination a swinging frame, a hammer mounted thereon, a pivotally mounted actuating handle movable also in a direction at right angles to its pivotal axis and carried in the same frame, and inlet control valves for admission of driving fluid into the hammer, an operative connection between the handle and the hammer and valve whereby pivotal movement of the handle serves to move the hammer relatively to the frame and also to actuate the valve, a lug on the handle and a co operating abutment on the frame, the said lug having a surface concentric with the pivotal axis of the hammer and a contiguous end face to engage the abutment in order to lock the handle against swinging movement in one direction relatively to the frame.

6. A drill sharpening machine comprising in combination a swinging frame movable between two limits representing respectively upsetting and forming positlons, a hammer slidably mounted in the frame, an actuating handle which is pivotally mounted in the frame and is also movable in a direction transverse to the pivotal axis, means operatively connecting the handle with the hammer whereby pivotal movement of the handle will slide the hammer to and fro in the frame, an abutment on the frame, and a lug on the handle, said lug having a surface concentric with the pivotal axis to engage the abutment and to retain the handle in one position in its transverse movement and having also a part to abut against the lug when the handle is in another position in its transverse movement thereby to lock the handle to the frame, for the purpose described.

7. A drill sharpening machine comprising in combination a hammer, a swinging frame in which the hammer is mounted and on which it is movable respectively into upsetting and forming positions, gripping jaws for the workpiece, a clamp on the frame to be moved thereby into and out from engagement with a movable one of said jaws to hold it towards its companion jaw when the frame is in one position, and a projection on the frame movable into and out from engagement also with a movable one of said jaws in order to force it away from its companion jaw when the frame is in another position.

8. A drill sharpening machine according to claim 7 in which the operative surfaces of the clamp and the projection are inclined to one another.

9. A drill sharpening machine comprising in combination relatively movable gripping jaws for the workpiece, a swinging frame comprising a guide for a hammer whereby the hammer is movable from a position facing the ends of the jaws to a position at right angles thereto, a clamp on the frame to engage a movable one of said jaws and to hold it towards its companion jaw when the hammer is swung to a position facing the ends of the jaws, a projection to engage the same jaw and to move it away from its companion jaw when the hammer is swung into its outer position, a single actuating handle pivotally mounted in the frame and operatively connected. to the hammer whereby pivotal movement of the handle will slide the hammer to and fro on its guide, and means to lock the handle to the frame in order that the same handle may be used to swing the frame.

10. A drill sharpening machine comprising in combination a pair of gripping jaws, a dolly carried in a fixed support opposite the ends of the jaws on one side, a forming tool comprising dies additional to said clamping jaws and supported opposite the ends of the jaws on the other side, a ham mer carried in a swinging frame by which it is movable into two extreme positions in which it is respectively in alignment with the dolly or with a forming tool, means on the swinging frame operatively to engage one of the jaws to close or open it respectively when the hammer is in alignment with the dolly or with the forming tool, and iiuid-pressure means operable on the companion jaw to move it towards the closed position.

11. A drill sharpening machine comprising in combination a pair of gripping jaws, a dolly carried in a fixed support opposite the ends of the jaws on one side, forming tools supported opposite the ends of the jaws on the other side, a fluid actuated hammer carried in a swinging frame by which it is movable into two extreme positions in which it is respectively in alignment with the dolly or with a forming tool, means on the swinging frame operatively to engage one of the jaws to close or open it respectively when the hammer is in alignment with the dolly or with the forming tool, fluidpressure means operable on the companion jaw to move it towards the closed position, a valve to control supply of pressure-fluid to the hammer, and a single means to move the hammer and to control said valve.

12. In a drill-sharpening machine the combination of a forming tool comprising dies, an upsetting tool, a single hammer relatively movable with respect to said tools for operating either one at will, and clamping means additional to said dies for holding the workpiece while it is being upset.

13. In a drillsharpening machine the combination of a forming tool comprising dies, an upse ting tool, a single hammer relatively movable with respect to said tools for operating either one at will, relatively movable clamping jaws additional to said dies for holding the workpiece while it is being upset, and jaw-opening means actuated by movement of said hammer into the position for operating the forming tool.

14. In a drill-sharpening machine the combination of a forming tool comprising dies, an upsetting tool, a single hammer relatively movable with respect to said tools for operating either one at will, relatively movable clamping jaws additional to said dies for holding the workpiece while it is being upset, and means operatively connected with and movable with the hammer to engage and hold one of said jaws closed when the hammer is brought to a position to operate the upsetting tool.

15. In a drill-sharpening machine the combination of a forming tool comprising dies, an upsetting tool, a single hammer relatively movable with respect to said tools for operating either one at will, relatively movable clamping jaws additional to said dies for holding the workpiece while it is being upset, jaw-opening means actuated by movement of said hammer into a position to operate the forming tool, and means operatively connected with and movable with the hammer to engage and hold one of said aws closed when the hammer is brought to a position to operate the upsetting tool.

16. In a drill-sharpening machine the combination of a forming tool comprising dies, an upsetting tool,rgripping jaws for the workpiece additional to said dies for holding the workpiece while it is being upset, a hammer, a swinging frame which carries the hammer and by which the hammer is movable into upsetting and forming posi tions, and a clamp on the frame to be moved therewith into engagement with one of said gripping jaws to hold it closed as the hammer 1s swung into position to operate the upsetting tool.

17. In a drill-sharpening machine, the combination of a forming tool comprising dies, an upsetting tool, clamping jaws additional to said dies for holding the workpiece While it is being upset, a hammer, a swinging frame which carries the hammer and by which the hammer is movable into upsetting and forming positions, a projection on the swinging frame movable into engagement with one of said gripping jaws to force it away from its companion as the hammer is swung into the position for operating on the forming tool.

18. In a drill-sharpening machine the combination of a forming tool comprising dies, an upsetting tool, clamping jaws for the workpiece additional to said dies for holding the workpiece while it is being upset, a swinging frame which carries the hammer and by which the hammer is movable into positions to co-operate with the upsetting and forming tools, a clamp on the frame to be moved thereby into engagement with one of the gripping jaws to close it as the hammer is swung into operative relation with the upsetting tool and a projection 011 the swinging frame movable into engagement with said jaw to force it away from its companion jaw when the hammer is moved into operative relation with the forming tool.

In testimony whereof I affix my signature.

JAMES RULE. 

